Can't copy files to external USB drive on my Mac

Question

 

In order to exchange files, after connecting a friend’s USB hard drive to my Mac, I can read and copy files from it, but cannot copy my files to that drive. It seems locked. In fact, this happens with every USB disk that I connect to my Mac computer. 

 

What’s wrong? How can I resolve this?

Answer 1

The USB disk you are using must be formatted in NTFS format. On Mac OS X, you can read NTFS disks but cannot write to them (or delete any files on NTFS) by default.

There's a low cost solution to be able to write to and delete files from NTFS disks:

See this article:

http://maclord.ozarweb.com/mevzu/problem-writing-ntfs-on-mac/